See for example the problem issue here:http://drupal.org/node/1171866http://drupal.org/drupal-7.14Where the security release (Drupal 7.13) is unaffected, and which is the most important reason to update, but D7.14 introduced new problems.
IMO, Softaculous should offer a choice between updating to only the security release, or to the full new general bugfix release.